Suzy Smith and her friends have gathered again for the relaunch of The Impossible Postal Express. The celebrations don't last long though, before Trollville is rocked by a violent earthquake--the first in the city's history. It's clear something sinister is underfoot. Nevertheless Suzy's got a very late package that the Impossible Postal Service must deliver. ('Come rain, shine, or meteor shower!') And it may just lead her to some answers. In this second book in the Train to Impossible Places trilogy, Suzy and the crew aboard the Express will test out the train's higher speeds and other kinks--uh, new features. They will travel deep below Trollville through the Uncanny Valley, and sky-high to new impossible places like Cloud Forge. Finally, they'll meet unusual allies and enemies alike, from a renegade troll to an obnoxious magician, and face a threat greater than anything they ever could have imagined.